The unprecedented 2015/16 Tasman Sea marine heatwave

The Tasman Sea off southeast Australia exhibited its longest and most intense marine heatwave ever recorded in 2015/16. Here we report on several inter-related aspects of this event: observed characteristics, physical drivers, ecological impacts and the role of climate change. This marine heatwave lasted for 251 days reaching a maximum intensity of 2.9 °C above climatology. The anomalous warming is dominated by anomalous convergence of heat linked to the southward flowing East Australian Current. Ecosystem impacts range from new disease outbreaks in farmed shellfish, mortality of wild molluscs and out-of-range species observations. Global climate models indicate it is very likely to be that the occurrence of an extreme warming event of this duration or intensity in this region is respectively ≥330 times and ≥6.8 times as likely to be due to the influence of anthropogenic climate change. Climate projections indicate that event likelihoods will increase in the future, due to increasing anthropogenic influences.

[1]  J. Willis,et al.  Interannual variability in upper ocean heat content, temperature, and thermosteric expansion on global scales , 2004 .

[2]  Carlo Cerrano,et al.  Mass mortality in Northwestern Mediterranean rocky benthic communities: effects of the 2003 heat wave , 2008 .

[3]  A. Gordon,et al.  Pacific western boundary currents and their roles in climate , 2015, Nature.

[4]  Young‐Oh Kwon,et al.  The role of atmospheric forcing versus ocean advection during the extreme warming of the Northeast U.S. continental shelf in 2012 , 2015 .

[5]  G. Hosie,et al.  Climate change cascades: Shifts in oceanography, species' ranges and subtidal marine community dynamics in eastern Tasmania , 2011 .

[6]  M. Feng,et al.  Spatial patterns of warming off Western Australia during the 2011 Ningaloo Niño: quantifying impacts of remote and local forcing , 2014 .

[7]  Elizabeth C. Kent,et al.  Global analyses of sea surface temperature, sea ice, and night marine air temperature since the late nineteenth century , 2003 .

[8]  M. Feng,et al.  Management adaptation of invertebrate fisheries to an extreme marine heat wave event at a global warming hot spot , 2016, Ecology and evolution.

[9]  N. Holbrook,et al.  Projected Tasman Sea Extremes in Sea Surface Temperature through the Twenty-First Century , 2014 .

[10]  Louise B. Firth,et al.  Air temperature and winter mortality: Implications for the persistence of the invasive mussel, Perna viridis in the intertidal zone of the south-eastern United States , 2011 .

[11]  B. Gillanders,et al.  Impact of changes in flow of freshwater on estuarine and open coastal habitats and the associated organisms , 2002 .

[12]  G. Pecl,et al.  Identification of global marine hotspots: sentinels for change and vanguards for adaptation action , 2014, Reviews in Fish Biology and Fisheries.

[13]  Alistair J. Hobday,et al.  A hierarchical approach to defining marine heatwaves , 2016 .

[14]  G. De’ath,et al.  The 27–year decline of coral cover on the Great Barrier Reef and its causes , 2012, Proceedings of the National Academy of Sciences.

[15]  S. Power,et al.  ENSO to multi-decadal time scale changes in East Australian Current transports and Fort Denison sea level: Oceanic Rossby waves as the connecting mechanism , 2011 .

[16]  Peter Brauer,et al.  Field‐aligned currents' scale analysis performed with the Swarm constellation , 2014 .

[17]  C. Wunsch,et al.  Temporal Changes in Ocean Eddy Transports , 2006 .

[18]  D. Roemmich,et al.  Ocean temperature climate off North‐East New Zealand , 2001 .

[19]  M. Feng,et al.  The rise and fall of the “marine heat wave” off Western Australia during the summer of 2010/2011 , 2013 .

[20]  P. Davies,et al.  Interannual variability in climate and fisheries in Tasmania , 1988, Nature.

[21]  A. J. Clarke,et al.  El Niño/La Niña shelf edge flow and Australian western rock lobsters , 2004 .

[22]  P. Stott,et al.  Dramatically increasing chance of extremely hot summers since the 2003 European heatwave , 2015 .

[23]  Kirsten Benkendorff,et al.  Ontogeny and water temperature influences the antiviral response of the Pacific oyster, Crassostrea gigas. , 2014, Fish & shellfish immunology.

[24]  Andrew C. Thomas,et al.  Fisheries Management in a Changing Climate Lessons from the 2012 Ocean Heat Wave in the Northwest Atlantic , 2013 .

[25]  Thomas M. Smith,et al.  Daily High-Resolution-Blended Analyses for Sea Surface Temperature , 2007 .

[26]  N. Moltschaniwskyj,et al.  Rapid assessment of an ocean warming hotspot reveals ''high'' confidence in potential species' range extensions , 2015 .

[27]  Corinne Le Quéré,et al.  Climate Change 2013: The Physical Science Basis , 2013 .

[28]  D. Karoly,et al.  Anthropogenic contributions to Australia's record summer temperatures of 2013 , 2013 .

[29]  G. Edgar,et al.  Long‐term shifts in abundance and distribution of a temperate fish fauna: a response to climate change and fishing practices , 2011 .

[30]  A. Olita,et al.  Effects of the 2003 European heatwave on the Central Mediterranean Sea surface layer: a numerical simulation , 2006 .

[31]  S. Riser,et al.  Decadal Spinup of the South Pacific Subtropical Gyre , 2007 .

[32]  P. Oke,et al.  Towards a dynamically balanced eddy-resolving ocean reanalysis: BRAN3 , 2013 .

[33]  N. Holbrook,et al.  Southwest Pacific subtropical mode water: A climatology , 2007 .

[34]  B. Hamon,et al.  The El Nino-Southern Oscillation in south-eastern Australian waters , 1991 .

[35]  Karl E. Taylor,et al.  An overview of CMIP5 and the experiment design , 2012 .

[36]  H. Loon,et al.  The Southern Oscillation. Part IV: The Precursors South of 15°S to the Extremes of the Oscillation , 1985 .

[37]  Steven J. Lentz,et al.  Diagnosing the warming of the Northeastern U.S. Coastal Ocean in 2012: A linkage between the atmospheric jet stream variability and ocean response , 2014 .

[38]  Takashi Kagimoto,et al.  Decadal Sea Level Variability in the South Pacific in a Global Eddy-Resolving Ocean Model Hindcast , 2008 .

[39]  R. Bozzano,et al.  The anomalous warming of summer 2003 in the surface layer of the Central Ligurian Sea (Western Mediterranean) , 2006 .

[40]  N. Bindoff,et al.  Interannual and Decadal Temperature Variability in the Southwest Pacific Ocean between 1955 and 1988. , 1997 .

[41]  D. Karoly,et al.  Attribution of the record high Central England temperature of 2014 to anthropogenic influences , 2015 .

[42]  C. Thompson,et al.  Relationship of air temperatures in New Zealand to regional anomalies in sea-surface temperature and atmospheric circulation , 1996 .

[43]  John Derber,et al.  A Global Oceanic Data Assimilation System , 1989 .

[44]  Nicholas A. Bond,et al.  Causes and impacts of the 2014 warm anomaly in the NE Pacific , 2015 .

[45]  N. Holbrook,et al.  Oscillatory and Propagating Modes of Temperature Variability at the 3-3.5- and 4-4.5-yr Time Scales in the Upper Southwest Pacific Ocean. , 2005 .

[46]  J. Sanderson.  Subtidal macroalgal studies in east and south eastern Tasmanian coastal waters , 1990 .

[47]  A. Gilroy,et al.  Optimum temperature for growth of Australian abalone: preferred temperature and critical thermal maximum for blacklip abalone, Haliotis rubra (Leach), and greenlip abalone, Haliotis laevigata (Leach) , 1998 .

[48]  Uang,et al.  The NCEP Climate Forecast System Reanalysis , 2010 .

[49]  F. Tuya,et al.  An extreme climatic event alters marine ecosystem structure in a global biodiversity hotspot , 2013 .

[50]  M. Coleman,et al.  Long‐term trends in the East Australian Current separation latitude and eddy driven transport , 2014 .

[51]  Myles Allen,et al.  Liability for climate change , 2003, Nature.

[52]  G. Harris,et al.  The water masses of the east coast of Tasmania: seasonal and interannual variability and the influence on phytoplankton biomass and productivity , 1987 .

[53]  Corinne Le Quéré,et al.  The challenge to keep global warming below 2 °C , 2013 .

[54]  K. Ridgway.  Long‐term trend and decadal variability of the southward penetration of the East Australian Current , 2007 .

[55]  D. Wethey,et al.  Three decades of high-resolution coastal sea surface temperatures reveal more than warming , 2012, Nature Communications.

[56]  G. Meyers,et al.  An Intersection of Oceanic Waveguides: Variability in the Indonesian Throughflow Region , 2004 .

[57]  M. Iredell,et al.  The NCEP Climate Forecast System Version 2 , 2014 .

[58]  T. O'Kane,et al.  Decadal-Scale Forecasting of Climate Drivers for Marine Applications. , 2016, Advances in marine biology.

[59]  P. Stott,et al.  Human contribution to the European heatwave of 2003 , 2004, Nature.

[60]  N. Holbrook,et al.  Projected changes to Tasman Sea eddies in a future climate , 2015 .

[61]  N. Holbrook,et al.  Extending our understanding of South Pacific gyre “spin‐up”: Modeling the East Australian Current in a future climate , 2014 .

[62]  J. Sprintall,et al.  Regional climate variability and ocean heat transport in the , 1995 .

[63]  D. W. Scott,et al.  Multivariate Density Estimation, Theory, Practice and Visualization , 1992 .

[64]  A. T. Doodson,et al.  The analysis of tidal observations , 1928 .